Add documentation for all PDF tools

docs/tools/view-metadata.md

@@ -0,0 +1,51 @@
+---
+title: View Metadata
+description: Inspect all metadata properties of a PDF including document info, XMP data, and structural details.
+---
+
+# View Metadata
+
+Examine the hidden properties embedded in a PDF file. The tool displays document information (title, author, dates), XMP metadata, page dimensions, and other structural data in a readable format.
+
+## How It Works
+
+1. Upload a PDF file.
+2. The tool immediately parses the file and displays all available metadata in organized sections.
+3. Review the document info dictionary, XMP metadata tree, and structural properties.
+4. No processing step is needed -- metadata is displayed as soon as the file loads.
+
+## Features
+
+- Displays standard document info fields: Title, Author, Subject, Keywords, Creator, Producer
+- Shows creation and modification dates in human-readable format
+- Parses and renders the full XMP metadata tree with nested namespaces
+- Handles PDF date format (`D:20240101120000Z`) conversion to readable dates
+- Organized into collapsible sections for easy navigation
+
+## Metadata Sections
+
+| Section                 | Contents                                                                              |
+| ----------------------- | ------------------------------------------------------------------------------------- |
+| **Document Info**       | Title, Author, Subject, Keywords, Creator, Producer, Creation Date, Modification Date |
+| **XMP Metadata**        | Full XML-based metadata tree with Dublin Core, XAP, PDF, and custom namespaces        |
+| **Document Properties** | Page count, PDF version, file size, encryption status                                 |
+
+## Use Cases
+
+- Checking who authored a PDF and when it was last modified
+- Verifying that metadata was properly set before publishing a document
+- Auditing PDFs for privacy by checking what personal information is embedded
+- Investigating the software used to create or modify a PDF (via the Producer field)
+- Reviewing XMP metadata for digital asset management compliance
+
+## Tips
+
+- PDF date strings that start with `D:` are automatically converted to your local timezone format.
+- If metadata fields appear empty, the PDF creator simply did not set them. Not all PDFs contain rich metadata.
+- To modify metadata after inspecting it, use [Edit Metadata](./edit-metadata). To strip it entirely, use Remove Metadata.
+
+## Related Tools
+
+- [Edit Metadata](./edit-metadata)
+- [PDF OCG Layers](./pdf-layers)
+- [Compare PDFs](./compare-pdfs)